The author suggests to select Cracked as concrete is cracked all the time.

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About This Spreadsheet

This spreadsheet is to design group stud anchor anchorage to concrete using ACI 318-11 code.

Using ACI 318-11 code in imperial unit

Stud anchors work as a group

Stud anchor group is subject to tensile, shear and moment

Using concrete to resist concrete tensile and shear breakout

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No of Bolt Along Outermost Bolt Line
This no of bolt will be used as nT1 to calculate the welded stud
tensile force caused by moment.

No of Bolt Along Side Edge
This no of bolt will be used to check anchors concrete shear breakout strength with shear force parallel to an edge as per ACI 318-11
D.6.2.1 (c)

Outermost Bolt Line Spacing s1
s1 is the distance between two outermost columns of welded stud line , along shear force acting direction

Outermost Bolt Line Spacing s2
s2 is the distance between two outermost rows of welded stud line , perpendicular to shear force acting direction.

Internal Bolt Line Spacing sb2
sb2 is the internal bolt line spacing.
Ignore this input if it is 2 Bolt Line or 3 Bolt Line case.
This input will be calculated by program from sb2 = s1 - 2 x sb1

Internal Bolt Line Spacing sb1
sb1 is the internal bolt line spacing.
Ignore this input if it is 2 Bolt Line case.

Column Depth d
Column depth d

No of Bolt Carrying Tension nt

This input will be calculated by
the program based on user's
other inputs.

For an welded stud group carrying moment, only part of welded studs
in the group mobilizes tensile force.

nt is the number of bolt in the
group which mobilizes tensile
force.

Single Bolt Tensile Force T1Single bolt tensile force T1

Single Bolt Tensile Force T2Single bolt tensile force T2

Single Bolt Tensile Force T3Single bolt tensile force T3

Tensile Bolts Outer Distance stb

When welded stud group carries moment and only part of welded studs in the group mobilizes tensile force, stb is the distance between two outermost columns of tensile welded stud line , along moment applying direction.

For welded stud group which has only two columns of bolt line, only one bolt line mobilizes tensile force, in this case stb =0

This parameter is calculated by the program.

Bolt Group Tensile Force Eccentricity e'N
Eccentricity e'N -- distance between resultant of tensile load and centroid of anchors as illustrated in ACI 318-11 Fig. RD.5.2.4 (b)
This parameter is calculated by the program.